Rotary scraper



Feb. 22, 1938.

ROTARY SGRAPER Filed April l1, 1936 2 Sheets-Sheet 1 H, M.' LIVINGSTON2,109,394

FifgJ.

Feb. 22, 1938. H. MLNINGSTON.

ROTARY SCRAPER Fil-ed April l1, 1956 2 Sheets-Sheet 2 Fig. 12 f/Patented Feb. z2, 193s f 2,109,394

UNITED `STATES PATENT OFFICE ROTARY SCRAPER Harry M. Livingston,Rainier, Wash. Application April 11, 1936, Seriai No. 73,948

sufficient space to permit the proper mounting of the scoop betweenthem. A short distance in front of the scoop space, a cross brace 3extends from one leg 2 to the other, being suitably secured thereto bymeans of the riveted plate 4; A double longitudinal bar or plate 5 issecured to the center of the cross brace 3 and extends straight forwardtherefrom. The channels I are bent at the plates 4 and are inclinedinward to ,join the said double central plate 5 and are again bent atthis point to lie in contact with the said plate 5. A top plate 6 issecured to both the channels I adjacent the point where they meet thesaid central plates 5. The front portion of the channels I are eachvsecured to the said plates 5 to form a rigid connection.

The rear ends of the legs 2 o1' the channels I are each provided with atrunnion lbearing block l comprising a heavy body securely fastened bybolts to each said leg 2 (Fig. 1) andhaving a bearing hole thereinadapted to receive the shank 8 or" the trunnion (Fig. 8) This trunnioncomprises a heavy strong body securely bolted to the side plate 9 of thescoop and having the cylindrical shank 8 integral therewith andextending laterally therefromk and provided with an axial hole throughsaid shank and bodyv and through the plate 9 of the scoop. The bearingblock 1 ts on the shank 8 against a shoulder I0. The shank 8 extendsslightly out beyond the outside surface of the bearing block 1. Acomparatively light bolt I I, having a large head I2 is passed throughthe central hole in the shank' and is secured bya nut bearing on theinner side of the plate il of the scoop. The head I2 is of greaterdiameter than the shank 8 and therefore holds the bearing block I frompullingoif of the said shank 8 and yet permits a perfectly free rotarymotion of the trunnion shank 8 in the bearing block 1. The rigid body ofthe trunnion 8 is provided with a wide base in contact with the plate 9ofthe scoop, said base being secured to the plate by means of largebolts 88, thus distributing the stresses from thetrunnion to the plateand reducing the tendency to tear the said plate.

kThe scoop comprises an open, substantially rectangular, body having thetwo end walls or plates 9, a bottom I3, a curved lower rear corner platei4 and a rear plate I5. The front portion of the bottom is formed of aheavy wearing plate I6 which comprises the cutting blade of the scoopand which is bent up on each side to fit outside along in Fig. 4 andconsists of a pair of compleof the sidewalls 9 to which 'it is removablyatmentary bent channel irons 'I. The rear legs 2 of tached 'by suitablebolts orrivets. A suitable these channels I are parallel and areseparated by angle-iron brace I1 extends around the upper 4 Claims.

This invention relates to dirt movers, commonly known as rotaryScrapers, and has special reference to such Scrapers as are adapted tobe operated by a tractor or other power-driven means.

The objects of my invention arci-first, to provide improved meanswhereby the angle of the scoop is controlled; second, to provide animproved form of scoop, which is simpler to make, stronger and moreeconomical to operate; third, to provide a scoop in which the wearingplates may be easily removed and replaced, thereby lengthening theuseful life of the scoop; fourth, to provide a scoop which may be easilyreversed in its framerand operated by being pushed in front of thetractor, thereby permitting. it to function in soft ground; fifth, toprovide a scoop which is non-cylindrical in form and yet which providesa means for the control beam to engage it at a substantially equaldistance above the trunnions at all attitudes of the scoop; and

sixth, to improve the construction of the scoop whereby the trunnionsare secured to the scoop in such manner that they will not tear theplates under severe usage and yet hold the frame legs in place bya lightbolt.

I attain these and other objects by the devices and arrangementsillustrated in the accompanying drawings, in which- Fig. lis a sideelevation of my improved scraper, showing it in position for taking ashallow cut in the earth; Fig. 2 is a plan thereof; Fig. 3 is alongitudinal section of the outer end of the control beam, showing thecams for releasing the scraper from the control beam; Fig. 4 is a planview of the frame; Fig. 5 is a view, similar to Fig. 1, showing thescraper adjusted to take a deep cut in the earth; Fig. 6 shows thescraper in dumping position; Fig. 7 is a view of the scraper when placedin reversed position to be pushed by the tractor, and taking a deep cutin the earth; Fig. 8 is a section of the trunnion connection between thescoop and the frame; Fig. 9 is a front elevation of the scoop; Fig. 10is a vertical section thereof; Fig. 11 is a section of a portion of thecontrol mechanism taken on the line II-II in Fig. 12; and Fig. 12 is aside elevation of the control mechanism, showing parts thereof brokenaway to illustrate the construction thereof.

ASimilar numerals of reference refer to similar parts throughout theseveral views.

The frame of my improved scraper is shown edges of the sides 9 and rearplate I5. An inverted channel-iron bridge I8 extends across the top ofthe scoop substantially vertically above the trunnion, from one sidewall 9 to the other, and

is bent upward therefrom, as shown in Fig. 9, a suicient distance sothat its center is substantially as far from the trunnion as is the backplate I5. This bridge I8 forms a very rigid means connecting the si-deplates 9 and is a great improvement over the common practice of bringingthe back plate over the top of the scoop in a cylindrical form, and italso permits a substantial saving in material in the sides and back ofthe scoop without losing any rigidity or strength. Two pairs of crossedbraces I3 extend from the bottom i3 to the rear plate I5 and the bridgeI8 (Fig. l0), said braces being preferably welded together where theycross. The bridge I8 is also braced to the top of the rear plate I5 bythe side braces 253 and the central brace 2l.

A pair of vertical angle-irons 22, having spaced holes 23 therein aresecured in spaced relation to each other to the outside of the rearplate I5 of the scoop, forming a central rack. A bar 24 is provided withdown-turned ears 25, adapted to lie outside of the legs of the two saidangle-irons 22. A long bolt 26 passes through the ears 25 and thecorresponding holes 23 of the angle-iron rack 22. The position of thesaid bar 24 along the angle-iron rack determines the relative positionor attitude of the scoop when dumping (Fig. 6).

The front edges of the two side walls 9 of the scoop are provided withwide skid plates 2l suitable curved, if desired, and secured to the saidside walls by means of extension arms 28.

Suitable wearing plates or shoes 2S may be secured to the bottom, thecurved corner I4 and the rear plate I5, to take up the wear when thescoop is turned upward to slide thereon in transporting the dirt fromone place to another.

A slide guide is mounted on the cross plate 6 of the frame and comprisestwo complementary parallel spaced castings 34, each provided with ahorizontal groove 3! (Fig. 11) and suitably secured to the plate 6. Asliding beam 32 is mounted between the said castings 39 and is providedwith suitable lugs 33 adapted to ride freely in the said grooves 3l ofthe guide castings 30. This beam 32 lies over the front end of the frameand its front end is pivotally connected to a pair of links or levers34, which are themselves pivoted at 35 to the front end of the frame andwhich extend down below the frame to a pivotal connection with thecoupling link 36 which is adapted to be secured to the tractor or otherpropelling machine. The rear end of the beam 32 is pivotally secured toa link 3'! connecting it to the operating lever 3B. This lever 33 ispivoted at 39 to the central plates 5. The lever 38 extends down belowthe pivot 39. The above-described connecting link 3l is adapted to beconnected at its rear end to the said operating lever 38 either at 40,above the pivot 39, or at 4I 4at the lower end of the lever 38. When thescoop is attached to the tractor to be dragged thereby, as shown inFigs. 1, 5 and 6, the link 3? is connected at 4l! to the lever 38, butwhen the scoop is connected to be pushed bythe tractor, as in Fig. "I,the connection is made at the point 4l.

A suitable pulley wheel 42 is mounted on the upper end of the operatinglever 38. A rope or light cable 43 extends from the drivers seat on thetractor, around the said pulley wheel 42 and is secured to thebell-crank latch lever 44, hereinafter described.

The sliding beam 32 is provided, at a point therein adjacent the saidguide castings 30, with a channel or U-shaped extension 45 (Figs. 11 and12) rigidly secured thereto by welding, or otherwise, the latch lever 44is mounted between the legs of the said channel 45, .at the forward endthereof. One leg of the said bell-crank latch lever 44 extends upwardfrom the said channel 45 to receive the end of the rope 43, attachedthereto, and the other leg thereof extending forward and bifurcated atits end to receive Vthe control pin 45, which is mounted in a verticalhole' in thesaid sliding beam 32 and extends therethrough, and which isadapted to enter one of a series of spaced holes 4l made in the plate 6of the frame (Fig. 12). A spring 48 engages the upper end of thebell-crank lever 44 to oppose the pull of the rope 43 and to normallyhold the front leg of the lever 44 down, thereby permitting the pin 46to remain in the hole 4l in which it may be located, until removedtherefrom by a pull on the rope 43.

The rear end of the channel 45 is pivotally connected to the controlbeam 49. This beam 49 is preferably formed of two plates rivetedtogether P from the said connection with the channel45 rearward, butseparated at the rear portion to receive the hereinafter describedreleasing levers. Two pairs of teeth or engaging lugs or plates 5I)v and5I are secured to the sides of the control beam 45, at such pointstherein that the front lug 54 engages the front side of the bridge I8 ofthe scoop when the scoop is in digging position and such that the rearlug 5I engages the said bridge I3 when the scoop is turned into carryingor transporting position (not shown) and is sliding o-n the abovedescribed shoes 29. It is evident that the position of the scoop,therefore, depends on the longitudinal position of the sliding beam 32,and therefore on the particular hole 41 into which the pin 46 isengaged. The fur,-

ther forward that the pin 4S is placed, the deeper the cut which thescoop will take, while, if the cable 54 leading to the drivers seat onthe tractor.

The said cam lever 52 is connected to the rear cam lever 53 by means ofa connecting rod 55. A spring 56 engages the rear lever 53 to draw itrearward in opposition to the pull on the rope 54. larly in Fig. 3 andare provided with lower portions normally lying in the space betweenthe.

two parts of the control beam 43 and out of engagement with the bridgeI8, but when the rope 54 is pulled they turn in unison on their pivotsand emerge from the beam 49 so that one or the other engages the saidbridge I8 andlifts the beam 43 sufficiently so that the teeth or lugs f54 and 5l are entirely clear of the said bridge, I8, thereby releasingthe scoop from the control of said beam.

It is evident that when the tractor is pulling or pushing on the link 36it tends to force the sliding bar 32 along the frame and this motion is;

prevented by the pin 46 in its chosen hole and The cam levers 52 and 53are shown particu-g coy therefore the pin 46 is locked or clamped in itshole by the side pressure exerted thereon. In. order, then, to alter theadjustment of the scoop,y

it is necessary to rst relieve the link 35 from stress from the tractor;second, to pull on the rope 43 to draw the pin 45 out of its hole and tohold it out by keeping the rope 43 taut; and third, if it is desired toadjust the bar 32 forward, the tractor may be backed slightly, thusdrawing the bar 32 forward, or vice versa, until the desired adjustmenthas been secured, when the rope 43 is released, thus dropping the pin 46in the appropriate hole.

Referring, now, particularly to Fig. 7, in which the relative positionsof the tractor and scraper are reversed, it is necessary to make thefollowing changes. First the scoop is removed from the frame andreversed therein; then the connecting link 31 is disconnected from thepoint i0 in the operating lever 38 and is connected to the said lever atthe point 4I below the pivot 39 thereof; then the teeth or lugs and 5lare removed from the control beam 49 and a reversed tooth or lug 5l issubstituted therefor. The apparatus is then ready for use, the tractorpushing on the coupling link 36.

Thus it will be seen that I have devised an improved scraper which isreadily and quickly adjusted to properly perform its desired functionsand which is simply yet ruggedly constructed and in which the wearingparts may be easily removed and renewed.

It is evident that many minor changes may be made in the details ofconstruction without departing from the spirit of my invention asoutlined in the appended claims.

Having therefore described my invention what I claim and desire tosecure by Letters Patent,

1. In a rotary scraper, the combination with a frame; a substantiallyrectangular scoop closed on its end, bottom, and rear sides but open onits top and front sides; trunnion connection between the frame and thescoop; a transverse bridge secured to the center of the upper edges ofthe end sides of the scoop and braced to the bottom and rear sides ,ofthe scoop; and a control beam mounted on the frame and releasablyengaging the bridge, whereby the rotation of the scoop is prevented.

2. In a rotary scraper, the combination with a frame; a scoop; trunnionconnection between the frame and the scoop; a transverse bridge securedto the center of the upper sides of the scoop; a sliding beam mounted onsaid frame; locking means mounted on said Sliding beam and engaging saidframe and adapted to hold said sliding beam in adjusted position on saidframe; and a control beam secured at one end to said sliding beam and atthe other end releasably engaging the bridge, whereby the rotation ofthe scoop is prevented and the scoop is held in adjusted position.

3. In a power actuated rotary scraper having a frame, a scoop pivotallysecured to said frame, and a control beam adapted to engage the scoop toprevent it from rotation, the combination with guiding means mounted onthe frame; of a sliding beam mounted in said guiding means; a pivotalconnection between said slidingbeam and said control beam; a leverpivoted on. said frame;

a link connecting said lever to said sliding beam, whereby said lever isadapted to adjust said sliding beam on said frame; and means adapted toselectively lock saidsliding beam in any of a series of positions,whereby the said scoop is held in a corresponding adjusted position.

4. In a power actuated rotary scraper as set forth in claim 3, whereinsaid lever is provided with alternate connections to said link, wherebysaid scoop may be similarly operated and controlled whether being pulledor pushed by the power applied thereto.

HARRY M. LIVINGsToN.

